320 THE GEOGRAPHY OF MAMMALS 



for its Tree-kangaroos (Dendrolagus), although this genus 

 likewise occurs in the tropical forests of Northern 

 Queensland. 



The second family of Diprotodont Marsupials — the 

 Phalangers (Phalangeridte) is likewise diffused over the 

 whole Australian Region, and has even crossed the dividing 

 line into Celebes, which, as already shown, must be included 

 in the Oriental Region in spite of its possessing this single 

 Marsupial form. This family contains some thirty-five 

 species divided into twelve genera. The typical genus 

 Phalavger is a characteristic form of the Papuan Sub- 

 region, and only touches Australia at its northern extremity. 

 It is of this genus that two species (P. ursinus and 

 P. celebensis) occur in Celebes, to which island and the 

 adjacent Sanghir Islands, so far as is at present known, 

 they are restricted. Two of the genera of this family are so 

 distinct from the remainder as to be generally assigned the 

 rank of sub-families of themselves. These are the curious 

 little Tarsipes, restricted to Western Australia, and the 

 Koala, or native Bear (Phascolarctus), which is widely distri- 

 buted in Eastern Australia but does not occur outside of it. 



Next to the Phalangers we must, I suppose, place the 

 new family of American Marsupials called by Mr. Thomas 

 Epanorthidte, as he refers the single genus yet known of 

 it to the extinct Epanorthidaz of Ameghino, which he 

 considers ought to include the recent as well as the fossil 

 members of that nearly extinct group. According to Mr. 

 Thomas the Neotropical Csenolestes is clearly a Diprotodont 

 Marsupial, as not only does it possess the characteristic 

 development of the lower incisors, but even its molar teeth 

 resemble most closely in structure those of certain members 

 of the Australian family Phalcmgeridze. Of Cxnolestes 



